As quoted in the AP article:
"You'll all have to see. I'm not saying anything until we unveil it," Phelps said with a grin when asked how he's tweaked the stroke. "It's a significant change. You'll be able to tell exactly what I did as soon as I take my first stroke."
He's on tap to swim the 100- and 200-meter free and the 100 butterfly at the Charlotte UltraSwim in NC. Should be interesting to see.
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What I just read it will have a higher turn over rate and a short pull.